Practice: A metal with a threshold frequency of 2.15 x 1015 s-1 emits an electron with a velocity of 7.03 x 106 m/s when radiation of 1.88 x 1015 s-1 strikes the metal’s surface. Calculate the mass of the electron.
What happens when light strikes the surface of a metal? The Photoelectric Effect can help to explain that.
Concept #1: Photoelectric Effect
Concept #2: Photoelectric Effect Formula
Example #1: The binding energy of electrons on a metal surface are 7.15 x 10-19 J. If an outside energy source with 4.33 x 10-17 J strikes the metal surface, what would be the kinetic energy of an ejected electron?
Concept #3: Photoelectric Effect Formula Expanded
Example #2: When the surface of metal is exposed to photons at a frequency of 7.13 x 1016 s-1, electrons are emitted with a maximum kinetic energy of 6.30 x 10-19 J. Calculate the work function of the metal.
Practice: A metal with a threshold frequency of 2.15 x 1015 s-1 emits an electron with a velocity of 7.03 x 106 m/s when radiation of 1.88 x 1015 s-1 strikes the metal’s surface. Calculate the mass of the electron.
Practice: An ultraviolet photon with a wavelength of 320 nm strikes a metal surface. The emitted electron has a kinetic energy of 1030 eV. What is the binding energy of the electron in kJ/mol? 1 electron volt (eV) = 1.602 x 10-19 J.
